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【单选题】
机械密封的关键元件是( )。A.
弹簧座
B.
辅助密封件
C.
静环
D.
动、静环
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反馈参考答案：
举一反三
【单选题】Some teenagers _____ their health because they often expose themselves to so many electric products. [ ]
A.
have damaged
B.
are damaging
C.
damaged
D.
will damage
【多选题】具体审计计划应当包括下列 ( ) 内容。
A.
注册会计师计划实施的风险评估程序的性质、时间和范围。
B.
注册会计师计划实施的进一步审计程序的性质、时间和范围。
C.
注册会计师针对审计业务需要实施的其他审计程序。
D.
导致注册会计师难以实施必要审计程序的情形
【简答题】What is R&D dept.?
【简答题】Using tables of reduction potentials, predict the products of the reac tions of withexcess(a)Fe 2+ (b)Zn (c)Fe (d)H -
【单选题】We learn from the text that users of wireless products are more often than not confronted with
A.
missing networks.
B.
technical failures.
C.
wrong standards.
D.
confusing choices.
【单选题】Industrial products are often the result of ______ according to the passage.
A.
laboratory work
B.
market survey
C.
commercial research
D.
business growth
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