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【简答题】
直流稳压电源一般由变压器、 、 、稳压电路等四部分构成。
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举一反三
【多选题】关于腹腔穿刺过程正确的是( )
A.
消毒：以穿刺点为中心，直径15cm
B.
铺巾：先戴手套，再铺消毒洞巾
C.
局麻：左手固定穿刺点皮肤，先打皮丘，再逐层浸润麻醉
D.
穿刺：从穿刺点45°斜刺入皮下，皮下移行2cm再垂直进针
E.
抽液：逐管抽取腹水，留样送检，记录抽取腹水总量
【单选题】We should be quick ______ he has climbed up the top of the mountain.
A.
that
B.
in which
C.
which
D.
in that
【单选题】某地区为了掌握该地区陶瓷生产的质量情况,拟对占该地区陶瓷总产量90%的6家大型陶瓷厂的生产情况进行调查,这种调查方式是( )。
A.
普查
B.
典型调查
C.
抽样调查
D.
重点调查
【单选题】He had ever climbed this mountain several months before, but ________ he couldn’t find the way this time.
A.
anyhow
B.
somehow
C.
somewhat
D.
sometime
【单选题】Tom's leg got hurt when _______ up Jindingshan. [ ]
A.
climbing
B.
his climbing
C.
he climbed
D.
climbed
【单选题】Bob’s leg got hurt when _______ up Huangshan. [ ]
A.
climbing
B.
his climbing
C.
climbed
D.
he climbed
【单选题】He climbed up into the tree and picked all the apples ______ reach.
A.
within
B.
in
C.
be of his
D.
inside
【单选题】He climbed up into the tree and picked all the fruit______ reach.
A.
within
B.
beyond
C.
off
D.
inside
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