問題詳情
49.有關自來水輸水管流速之考慮，下列敘述何者錯誤？
(A)速度設計愈大，水頭損失愈大
(B)鋼筋混凝土管比鋼管可用較大的最高流速限值
(C)渾水輸水為防止泥砂等沉降，宜有最低流速（0.6 m/sec）之限值
(D)為防止沖蝕及水錘作用，宜有最高流速（3~6m/sec）之限值
(A)速度設計愈大，水頭損失愈大
(B)鋼筋混凝土管比鋼管可用較大的最高流速限值
(C)渾水輸水為防止泥砂等沉降，宜有最低流速（0.6 m/sec）之限值
(D)為防止沖蝕及水錘作用，宜有最高流速（3~6m/sec）之限值
參考答案
無參考答案
內容推薦
- 為控制水流僅能向一方向通過，應設置：(A)逆止閥(B)高度閥(C)減壓閥(D)排泥閥
- 自來水金屬管材產生腐蝕時，陰極會產生：(A)亞鐵離子(B)電子(C)氫氣(D)氧氣
- 自來水配水管與雨水及污水管渠，應至少保持多少水平距離？(A)0.3 公尺(B)3 公尺(C)30 公尺(D)300 公尺
- 延性鑄鐵管是在普通鑄鐵中加入何物質所造成的？(A)鎂(B)鈣(C)鋅(D)銅
- 有關水質的影響，下列敘述何者正確？(A)水中硝酸鹽含量超過 1mg/L（as N），容易使嬰兒發生藍嬰症(B)氯化物在 10mg/L 就會影響水的適飲性(C)水中含鐵較高時，洗滌衣服後易生斑點(
- 抽水機的靜吸水高度（suction lift），理論上的最高值是：(A)0.33 m(B)33m(C)33m(D)100.33m
- 抽水機在抽水量一單位與揚程一單位操作情形下之轉動速度，稱為抽水機的：(A)比速(B)定速(C)常速(D)率速
- 當抽水機尺寸一定時，抽水量（Q）與其轉速（N）之關係為：(A)Q α N(B)Q α N2(C)Q α N3(D)Q α N4
- 在抽水機吸水管上所裝的閥為：(A)底閥(B)逆止閥(C)高度閥(D)排氣閥
- 臺灣地區自來水的普及率為：(A)50-60%(B)60-70%(C)70-80%(D)90%以上
內容推薦
- II. Choose one correct answer for the following questionsWhich one is CORRECT for buffer capacit
- 如【圖 7】表示平皮帶繞於圓柱轂(drum)上的狀態，張力T1，T2及繞角β間的關係式為： 。於應用該關係式時，下列敘述何者錯誤？(A)β的單位是角度(degree)(B)T2是緊邊張力(C)T1
- The iron in a 0.6656-g ore sample was reduced quantitatively to the +2 state and then titrated w
- There is a titration of 00 mL of 0.0500 M Fe2+ with 0.1000 M Ce4+ in a medium (0 M H2SO4).
- Rank the following molecules in order of decreasing C-C bond length of their shortest C-C bonds.
- What mass of Ba(IO3)2 (487 g/mol) (Ksp = 57 × 10-9) can be dissolved in 400.0 mL of water at 2
- A compound exhibits an infrared band at 2245 cm-1 and is hydrolysed by mineral acid to give an o
- Compound X has an empirical formula CH2 and a molecular weight of When X is subjected to ozo
- A linkage map(A) reflects the frequency of crossing over between X and Y sex chromosomes.(B) can
- The snowball Earth hypothesis provides a possible explanation for the(A) oxygenation of Earth
- 下圖所示金氧半數位電路【題組】如上圖所示金氧半數位電路，它的邏輯閘功能？(A)非反相器 (B)反相器 (C)或閘 (D)和閘。
- Diets rich in fat release enterogastrones that inhibit(A) gastric secretion. (B) stomach peristal
- As a group, acoelomates are characterized by(A) deuterostome development.(B) the absence of a bra
- If mammalian cells receive a go-ahead signal at the G1 checkpoint, they will(A) move directly int
- Catastrophism was Cuvier's attempt to explain(A) natural selection. (B) uniformitarianism. (
- The shaping of an animal and its individual parts into a body form with specialized organs and ti
- Which of the following is descriptive of protosomes?(A) spiral and indeterminate cleavage, schiz
- Which of the following statements is correct?(A) Speciation occurs when mutations generate obser
- Which of the following is not true about micronutrients in plants?(A) They generally help in cat
- Which of the following statements is true?(A) The Hardy-Weinberg law applies to small, unstable
- Which of the following statements about primary productivity is correct?(A) The highest primary
- Which of the following terms did E. O. Wilson use to describe our innate appreciation of wild en
- Metathesis reactions have been known for many years, and one of examples is given as follow. Wha
- Almost all of the major animal phyla we see today appeared in the fossil record at the beginning
- Which of the following compounds does NOT react with acetyl chloride?(A) C2H5OH (B) C6H6 + AlCl3