在紊流光滑区,沿程水头损失系数 λ 是雷诺数的函数（）

A、仅与雷诺数有关

B、仅与相对粗糙度有关

C、仅与流速有关

D、与雷诺数及相对粗糙度有关

此题为判断题(对，错)。

A．层流区

B．紊流光滑区

C．紊流过渡区

D．紊流粗糙区

A．层流区

B．紊流光滑区

C．紊流过渡区

D．紊流粗糙区

A．层流和紊流光滑区

B．紊流过渡区

C．紊流粗糙区

A．只与雷诺数有关

B．只与相对粗糙度有关

C．只与绝对粗糙度有关

D．与相对粗糙度和雷诺数有关

Questions 9－10Complete the following sentences using NO MORE THAN THREE WORDS AND／OR A NUMQuestions 9-10 Complete the following sentences using NO MORE THAN THREE WORDS AND/OR A NUMBER for each. The address of the government bookshop is ______.

Questions 4－6Complete the following sentences using NO MORE THAN THREE WORDS AND／OR NUMBERQuestions 4-6 Complete the following sentences using NO MORE THAN THREE WORDS AND/OR NUMBERS for each. The customer’s address is ______ .