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【多选题】
柱式体系采煤法一般特点：（）。A.
在煤层内布置一系列宽为5～7m的煤房
B.
采房时矿山压力显现较和缓，用锚杆支护工作空间，支护较简单
C.
采煤用爆破或连续采煤机配套设备，采煤在一组交替作业
D.
在采煤工作面两端，一般各有一条回采巷道
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反馈参考答案：
举一反三
【单选题】What does the man ask the woman to do before tomorrow?
A.
To repair the computer by herself
B.
To ask for another person to help her
C.
To make copies of her work
D.
To check her back carefully
【简答题】艺术必须具有统一性 ,使建筑达到统一有三种方法
【简答题】Before the flight takes off, all passengers (ask) ______ to fasten their seat belts.
【单选题】Before building a house, you have to ask for the government’s _______.
A.
award
B.
permission
C.
request
D.
excuse
【单选题】Ask your father for some money, ______ you will be unable to buy a bicycle before September.
A.
or
B.
and
C.
then
D.
so
【单选题】_____________ he arrives before I get back，please ask him to wait.
A.
In the case of
B.
In case
C.
In case of
D.
In that case
【简答题】In case they arrive before I come back, please ask them to wait for a few minutes.
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