题目内容

保护组二可有43个主用物理C通道。

A. 正确
B. 错误

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试述癌性疼痛三阶梯疗法的药物选择。

Which statement is TRUE,according to the Rules().

A vessel not under command shall keep out of the way of a vessel restricted in her ability to maneuver
B. A vessel not under command shall avoid impeding the safe passage of a vessel constrained by her draft
C. A vessel constrained by her draft shall keep out of the way of a vessel engaged in fishing
D. A vessel engaged in fishing while underway shall,so far as possible,keep out of the way of a vessel restricted in her ability to maneuver

在大气压下,天然气的自燃温度约为()。

A. 480℃
B. 650℃
C. 520℃
D. 550℃

关于矿井涌水水源的一些特点,说法正确的是()。

A. 地表水主要是指渗入土地中的雨水
B. 松散层的裂隙涌水经常带有泥沙
C. 断层不一定成为地下涌水的通道
D. 砂岩、石灰岩通常成为裂隙水的主要通道
E. 老窑水经过一定时间后就可以疏干

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