无热再生空气干燥器需进行抽样时,一定要在()下进行
A、常压
B、低压
C、高压
D、(A、B、C.都可以
参考答案:A
—What do you think of sneezing in public?
—_______. [ ]
A. It's necessary
B. It's nothing
C. It's polite
D. It's impolite
组织指挥的方法是:督促检查、协调部队行动;适时修改作战方案;善于使用现场指挥图指挥。()