岗位职务分析的基本方法除了面谈法、观察法和问卷调查法以外，还包括：______。 A

— Tom doesn’t speak English __________ his classmates.

— I agree with you. But his written work is wonderful.[ ]

A. as often as

B. as many as

C. as good as

D. as well as

假设有足够多的黑白围棋子，按照一定的规律排成一行：

○●●○○●○●●○○●○●●○○●○●●○○●…

请问第2011个棋子是黑的还是白的？答：______．

电机车正常运行时，牵引电机处于（）状态；电气制动时处于（）状态。

液化天然气的成分是以（）为主的烷烃混合物。

A．丁烷

B．乙烷

C．甲烷

D．丙烷

工业气体设备台数的确定原则是( )。

A．大容量多机组
B．小容量多机组
C．大容量少机组