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【单选题】
第一次世界大战以来,防毒面具成为现代战争中不可缺少的军事用具之一。防毒面具之所以能够防毒,使人免受毒气的危害,其原因在于( )。
A.
防毒面具的滤毒罐中分不同层次放置有不同的酸性(主要是石炭酸)和碱性化合物(主要是氢氧化钾),它们可以有效地中和不同成分的有毒气体,从而使其毒性减弱或消失,进而防止毒害
B.
防毒面具的滤毒罐中装有活性炭,活性炭内含有极为丰富的孔,而且孑L的长度很长,它可以有效地吸附空气中的毒气分子,从而能够净化空气
C.
防毒面具的滤毒罐中装有湿润的合成纤维,它可以使水分子被牢牢吸附在纤维表面,当毒气分子进入时,会与纤维表面的水分子相结合,从而溶解于水中,而洁净的空气则可以自由出入,这样就起到了防毒作用
D.
防毒面具的滤毒罐中装配有小型电极,当毒气进人时,与人体呼出的水蒸气相结合,产生电离作用,在电极吸引下,阴离子吸附到阳极,阳离子吸附到阴极,从而阻止毒气进入人体
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参考答案:
举一反三
【单选题】How much money was lost?
A.
All of the money in the bank.
B.
No a penny.
C.
Some of the money in the bank.
【简答题】How much money does Ahmed want to borrow?
【单选题】—_____ are these apples? —Fif yuan. [     ]
A.
How much
B.
How money
C.
How many
D.
How many money
【单选题】How ____________ there in your pocket? [     ]
A.
many moneys are
B.
many money is
C.
much money is
D.
much moneys are
【判断题】非流动负债通常为取得非流动资产而发生,因此,非流动负债的金额通常比较大。( )
A.
正确
B.
错误
【单选题】—________ is it? —It's eight yuan a kilo. [     ]
A.
How much
B.
How money
C.
How many
D.
How many money
【简答题】党在过渡时期的总路线及其理论依据是什么?
【单选题】How much money was lost?
A.
All of the money in the hank.
B.
No a penny.
C.
Some of the money in the hank.
【单选题】How much money did Ana spend?
A.
A lot of money
B.
Not too much money
C.
Just a little money
【单选题】How ______ is the red coat? [     ]
A.
much
B.
many
C.
many money
D.
money
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