飞机在那个圈层内飞行最安全()
A.对流层
B.平流层
C.中间层
D.散逸层
参考答案:B
— Must I do the rest of the work today?
— No, you _________ finish it tomorrow.
A.must
B.can
C.needn’t
D.can’t
肘部尺神经病的治疗不包括()
A.避免屈肘
B.应用伸肘夹板
C.肘垫
D.NSAIDs
E.腕夹板