题目内容

方解石和白云石是陆源碎屑岩中的主要造岩矿物。

A. 正确
B. 错误

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采用串联通风的掘进工作面，必须在被串工作面局部通风机前设置掘进工作面进风流甲烷传感器，其断电浓度为（）%。

A. 0.5
B. 1.0
C. 1.5

试说明油品的粘温性质。

On vessels over 100 gross tons，whose responsibility is it to ensure that all able seamen in the vessel’s crew have the documents and qualifications required by law and regulation?（）

A. Master of the vessel
B. USCG Officer in Charge of Marine Inspection
C. Owner or operator of the vessel
D. Company's personnel director

眼科常用的化痰药有哪些？