皮皮学，免费搜题
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【单选题】
下列关于电气火灾监控系统的表述，不正确的是（ ）。A.
独立式电气火灾监控探测器可以自成系统，不需要配接电气火灾监控设备
B.
非独立式电气火灾监控探测器需要配接电气火灾监控设备组成系统，但其自身具有报警功能
C.
故障电弧式电气火灾监控探测器保护线路的长度不宜大于100m
D.
1000V以上的供电线路，宜选择光栅光纤测电气火灾监控探测器
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举一反三
【单选题】---I am going to the supermarket to buy a quilt. --- ________ You can easily buy one on the Internet.
A.
Why not?
B.
Good idea!
C.
Why bother?
D.
By no means.
【简答题】What can you do on the Internet? Many of us like to read the news, buy things and play s. Some students now have a new use for the Internet – helping them with their homework. Tina, 14, from She...
【单选题】To convince consumers that it’s safe to buy things over the Internet, businesses must _____.
A.
keep credit-card numbers safe
B.
protect passwords
C.
protect personal information
D.
do all of these
【简答题】The+ -er +S + V; the + -er + S + V; The + more + Adj + S + V; the + more + Adj + S + V (愈...愈...)
【多选题】假定计算出某球体直径的最佳估值为19.9937mm，(1)若计算出其测量不确定度为0.0027mm；（2）若计算出其测量不确定度为0.0017mm。两种情况下，按着有效数字规则，测量结果报道表示方法正确的是
A.
（ 1 9 .9937 ± 0.0027 ） mm
B.
（ 1 9 .994 ± 0.003 ） mm
C.
（ 1 9 .9937 ± 0.0017 ） mm
D.
（ 1 9 .9937 ± 0.002 ） mm
【单选题】You can buy almost everything ____ the Internet, and it’s very easy.
A.
into
B.
for
C.
at
D.
on
【单选题】With the Internet popular, more people________ the Internet to buy and sell items. [ ]
A.
turn to
B.
look for
C.
deal with
D.
talk about
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