采用滚筒驱动带式输送机运输时，必须装设驱动滚筒（）装置。
A.防干燥保护
B.防滑保护
C.堆煤保护
D.防跑偏保护
参考答案：B, C, D
11. The public has complained that large quantities of waste water ______ into rivers without being cleaned, so large amounts of money ______ to solve the problem.
A．have poured; is needed
B．has poured; are needed
C．have been poured; is needed
D．have been poured; are needed
支气管哮喘的肺功能特点，不正确的是（）
A.FVC下降
B.FEV下降
C.气道反应性下降
D.DLco下降
E.PEF变异率增加
