采煤工作面支设π型钢梁端头支护时要遵守“作业规程”中的规定，必须同时有（）以上协同操作。
A.1人
B.2人
C.3人
D.4人
参考答案：C
In Hyme's view, " ______ " refers to the ability not only to apply the grammatical rules of language but also to know when and where to use these and to whom.
A．linguistic competence
B．communicative competence
C．spontaneous capacity
D．language acquisition device(LA
椎间孔是由（）围成的
A.椎体与椎弓
B.椎弓与横突
C.上下两个相邻的椎弓根
D.椎弓板与椎弓根
E.两个相邻的椎弓板
