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【单选题】
下列哪些情况下船舶应用适合当时环境和情况的一切有效手段判断是否存在碰撞危险___。1大风浪中航行;2货仓起火,正在灭火;3船体破损进水正欲抢滩。
A.
1、2、3
B.
1、3
C.
2、3
D.
1
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举一反三
【单选题】—Where is Joy? —He _____ to the library [     ]
A.
 went
B.
has gone
C.
has been
【判断题】检索词只能是词语,分类号、作者姓名、机构名称、分子式、专利号、ISBN号与ISSN号等不能用作检索词。
A.
正确
B.
错误
【判断题】静态零点的电压一定是0V,因为它叫做“零点”。
A.
正确
B.
错误
【判断题】检索词只能是词语,分类号、作者姓名、机构名称、分子式、专利号、ISBN号与ISSN号等不能用作检索词
A.
正确
B.
错误
【判断题】在输入电压为零时,甲乙类推挽功放电路中的电源所消耗的功率是两个管子的静态电流与电源电压的乘积。( )
A.
正确
B.
错误
【单选题】----Is Mary at home? ----No, she_________ the library. She _________ there a moment ago.
A.
has gone to, went
B.
has gone to, has been
C.
has been to, went
D.
has been to, has gone
【单选题】Amy ____ the school library. She ______ books three times a week.
A.
has gone to; has used to borrow
B.
has been to; used to borrow
C.
has gone to; has been used to borrowing
D.
has been to; is used to borrowing
【单选题】—Is your brother at home? —No. He _______ the library. [     ]
A.
was going to
B.
has been to
C.
has gone to
D.
went to
【单选题】具有三组解理的矿物是( )。
A.
方解石
B.
正长石
C.
云母
D.
石英
【判断题】在输入电压为零时,甲乙类推挽功放电路中的电源所消耗的功率是两个管子的静态电流与电源电压的乘积。 ( )
A.
正确
B.
错误
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