游泳池浸脚消毒池水的余氯含量应保持每升水(),需4小时更换一次。
A.5-10mg
B.1-5mg
C.3-5mg
D.10-15mg
参考答案:A
单词拼写: (10分)
小题1:Urban inhabitants have to live with the _______(典型的,特有的) noises of cities.
小题2:I was very much pleased by your _________(分析) of the situation.
小题3:The old man was utterly ________(吸引) in the book.
小题4:The scientist often _________(做贡献)to an academic journal.
小题5:The board _________(拒绝) all our ideas.
小题6:The boss is _________(小心谨慎的) about making promises.
小题7:It seemed the water was to ________(责备)
小题8:He is very ________(严格) with his students.
小题9:His wound became ________(感染) with a new virus
小题10:The swimming pool is___________(可利用的) only in summer.
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