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【单选题】
每件成人救生衣在平静淡水中，应具有足够的浮力和稳性,将筋疲力尽或失去知觉人员的嘴部托出水面不低于______mm，其身体向后倾斜与垂直方向形成角度不少于______°。
A.
100,20
B.
120,30
C.
120,20
D.
100,30
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Exhausted(筋疲力尽)after the day’s work,_____to enjoy the evening.
A.
it was difficult for him
B.
for him it was difficult
C.
he found it difficult
D.
he found difficult