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【多选题】
关于气瓶的安全使用与维护，以下说法正确的是（ ）A.
气瓶使用时，一般放，并应有防止倾倒的措施
B.
使用氧气或氧化性气体气瓶时，操作者的双手、手套、工具、减压器、瓶阀等，凡有油脂的，必须脱脂完全后方能操作
C.
开启或关闭瓶阀时速度要缓慢，且只能用手或专用扳手，不准使用锤子、管钳或长柄螺纹板手
D.
瓶内气体不得用尽，必须留有一定剩余压力
E.
不得将气瓶靠近热源，安放气瓶的地点周围10米范围内，不应进行有明火或可能产生火花的作业
F.
气瓶在夏季使用时应防止暴晒导致气温升高、瓶内压力上升产生超压
G.
瓶阀冻结把气瓶移至较温暖的地方，用温水解冻，严禁用温度超过40℃的热源对气瓶加热
H.
应经常保持气瓶上油漆的完好，脱落或模糊不清时，应按规定重新；严禁敲击碰撞气瓶，严禁在气瓶上进行电焊引弧，不准用气瓶做支架
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举一反三
【单选题】在下面的 DO 循环中,一共要循环 ______ 次。 m = 5 n = 1 Do While n <= m n=n + 1 Loop
A.
3
B.
4
C.
5
D.
6
【单选题】The man in prison insisted that he _______ nothing wrong and _______ set free.
A.
should do, should be
B.
had done, should be
C.
had done, had been
D.
should do, had been
【单选题】All details should be carefully checked. Nothing should be __________.
A.
born in mind
B.
put up with
C.
taken for granted
D.
taken into consideration
【简答题】A.He should eat a little food. B.He should eat nothing. C.He should eat as much as possible. D.He can eat what he likes.
【单选题】He insisted that he _________ nothing wrong and ________free .
A.
should do ; should be set
B.
should do; had been set
C.
had done; should be set
D.
had done; had been set[
【单选题】I should say that we two have nothing ____.
A.
with common
B.
in time
C.
in common
D.
in need
【简答题】He ordered that nothing ________ until the police arrived. A: was touched B; should be touched C; had been touched
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