岩浆岩按其形成()分为()、()和().
参考答案:深度;深成岩;浅成岩;喷出岩.
Sorry, the other rooms have all been rented, and this is the only one ________. [ ]
A. available
B. adoptable
C. accessible
D. approachable
在完全湍流时,粗糙管的摩擦系数数值()
A.与光滑管一样
B.只取决于Re
C.取决于相对粗糙度
D.与粗糙度无关