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【单选题】
若要提高淬火时的淬硬层深度,应采取( )A.
选择高淬透性钢
B.
增大工件的截面尺寸
C.
选用比较缓和的冷却介质
D.
选择低淬透性钢
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Black broke his leg. He has just had _____X-ray examination .______ doctor said he needed ______ operation.
A.
a, The, an
B.
a, A, an
C.
an, A, an
D.
an, The, an
【单选题】He wants to see changes in the company and I am sure he will ______. [ ]
A.
on time
B.
at a time
C.
at one time
D.
in time
【单选题】It is the first time that he ______ here and now it is high time that he ______ around.
A.
come; should be shown
B.
has come; was shown
C.
came; was shown
D.
has come; be shown
【单选题】It is the first time he ________ here and now it is high time that he ________ around．
A.
come；should be showed
B.
has come；was showed
C.
has come；be showed
D.
came；was showed
【简答题】为什么说现在的手机也可以归类于多媒体终端?请举例说明。
【单选题】—He has few friends, ________? —________. So he feels lonely from time to time. [ ]
A.
hasn't he; Yes, he does.
B.
does he; No, he doesn't.
C.
doesn't he; No, he doesn't.
D.
has he; Yes, he does.
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