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【单选题】
下列焊接方法中,属于熔化焊的焊接方法是( )。A.
电阻对焊、氩弧焊；
B.
埋弧焊、CO2气体保护焊；
C.
摩擦焊、对焊；
D.
摩擦焊、埋弧焊。
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【简答题】One-third of the area _____ covered with green trees. About sy percent of the trees _____ been planted. A. are; have B. is; has C. is; have D. are; has 2. The number ...
【多选题】下列报文中，属于DHCP客户机发往DHCP服务器的是（）
A.
DHCP DISCOVER
B.
DHCP ACK
C.
DHCP OFFER
D.
DHCP REQUEST
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A.
腰椎管狭窄症
B.
腰椎间盘突出症
C.
慢性腰肌劳损
D.
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A.
腰椎管狭窄症
B.
腰椎间盘突出症
C.
慢性腰肌劳损
D.
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E.
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A.
腰椎管狭窄症
B.
腰椎间盘突出症
C.
慢性腰肌劳损
D.
马尾肿瘤
E.
腰椎肿瘤
【判断题】Rebuttal are w ords or phrases expressing the speaker's degree of force or certainty concerning the claim.
A.
正确
B.
错误
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A.
1
B.
2
C.
3
D.
4
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