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参考答案：
举一反三
【单选题】040mol/L碳酸溶液的pH值为(Ka1=4.2×10-7、Ka2=5.6×10-11)
A.
4.01
B.
3.87
C.
6.77
查看完整题目与答案
【单选题】Ice-breaker assistance for convoy will start at 1930 UTC.
A.
Ice-breaker assistance for fleet passage started at 1930 UTC.
B.
Ice-breaker assistance for fleet passage is due to start at 1930 UTC.
C.
Ice-breaker assistance for M.V. Convoy started at 1930 UTC.
D.
Ice-breaker assistance for M.V. Convoy is due to start at 1930 UTC.
查看完整题目与答案
【单选题】040mol/L碳酸溶液的PH值为（）。（Ka1=4.2×10-7,Ka2=5.6×10-11）
A.
3.89
B.
4.01
C.
3.87
D.
6.77
查看完整题目与答案
【单选题】Refseq数据库中,NM符号代表的是那种序列信息?
A.
基因组DNA
B.
mRNA
C.
protein
D.
mtDNA
查看完整题目与答案
【单选题】breaker
A.
轧钢机
B.
粉碎机
C.
断电器
查看完整题目与答案
【单选题】Ice-breaker assistance for convoy will start at 1930UTC
A.
Ice-breaker assistance for fleet passage stared at 1930UTC
B.
Ice-breaker assistance for fleet passage is due to start at 1930UTC
C.
Ice-breaker assistance for M.V. Convoy started at 1930UTC
D.
Ice-breaker assistance for M.V. Convoy is due to start at 1930UTC
查看完整题目与答案
【单选题】A circuit breaker differs from a fuse in that a circuit breaker （）.
A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may be reset
查看完整题目与答案
【单选题】A breaker's cheque is a negotiable instrument.
A.
正确
B.
错误
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【单选题】A circuit breaker differs from a fuse in that a circuit breaker ______.
A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules(环) at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may be reset
查看完整题目与答案
【单选题】The purpose of a main switchboard circuit breaker's reverse power trip is to _____.
A.
prevent main circuit overload
B.
protect the circuit breaker blowout coil
C.
prevent alternator motorization
D.
prevent low voltage tripout
查看完整题目与答案
相关题目：
【单选题】040mol/L碳酸溶液的pH值为(Ka1=4.2×10-7、Ka2=5.6×10-11)
A.
4.01
B.
3.87
C.
6.77
查看完整题目与答案
【单选题】Ice-breaker assistance for convoy will start at 1930 UTC.
A.
Ice-breaker assistance for fleet passage started at 1930 UTC.
B.
Ice-breaker assistance for fleet passage is due to start at 1930 UTC.
C.
Ice-breaker assistance for M.V. Convoy started at 1930 UTC.
D.
Ice-breaker assistance for M.V. Convoy is due to start at 1930 UTC.
查看完整题目与答案
【单选题】040mol/L碳酸溶液的PH值为（）。（Ka1=4.2×10-7,Ka2=5.6×10-11）
A.
3.89
B.
4.01
C.
3.87
D.
6.77
查看完整题目与答案
【单选题】Refseq数据库中,NM符号代表的是那种序列信息?
A.
基因组DNA
B.
mRNA
C.
protein
D.
mtDNA
查看完整题目与答案
【单选题】breaker
A.
轧钢机
B.
粉碎机
C.
断电器
查看完整题目与答案
【单选题】Ice-breaker assistance for convoy will start at 1930UTC
A.
Ice-breaker assistance for fleet passage stared at 1930UTC
B.
Ice-breaker assistance for fleet passage is due to start at 1930UTC
C.
Ice-breaker assistance for M.V. Convoy started at 1930UTC
D.
Ice-breaker assistance for M.V. Convoy is due to start at 1930UTC
查看完整题目与答案
【单选题】A circuit breaker differs from a fuse in that a circuit breaker （）.
A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may be reset
查看完整题目与答案
【单选题】A breaker's cheque is a negotiable instrument.
A.
正确
B.
错误
查看完整题目与答案
【单选题】A circuit breaker differs from a fuse in that a circuit breaker ______.
A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules(环) at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may be reset
查看完整题目与答案
【单选题】The purpose of a main switchboard circuit breaker's reverse power trip is to _____.
A.
prevent main circuit overload
B.
protect the circuit breaker blowout coil
C.
prevent alternator motorization
D.
prevent low voltage tripout
查看完整题目与答案
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