Accidentalfloodingoftheengineroombilgesbythebilgemainispreventedby（）.
A. stop-checkvalvesinstalledinthebilgemanifolds
B. usingapositivedisplacementreciprocatingbilgepump
C. installingeductorsinallbilgeroseboxes
D. installingaswingcheckbeforeeachbilgevalve
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Beforeenteringanicearea，theshipshouldbe（）.
A. eithertrimmedbytheheadorthestern
B. onanevenkeel
C. trimmeddownbythehead
D. trimmeddownbythestern
“6847汇划报文查询”交易，可以查询下列哪种农信银业务（）。
A. 电子汇兑
B. 银行汇票
C. 错账控制
D. 业务撤销
培养自生固氮菌应选用下列（）的培养基
A. 牛肉膏蛋白胨培养基：含牛肉膏、蛋白胨、水
B. 甘露醇酵母浸出液琼脂培养基：含甘露醇，KHPO、NaCl、CaCO、酵母汁等
C. 高氏1号培养基：含淀粉、水、KN0、NaCl、MgSO、FeSO等
D. 查氏培养基：含蔗糖、KCl、NaN0、FeS0、KHPO等
Inarefrigerationsystem,ifthecoolingwatertothecondenserfails,the（）.
A. boxtemperaturesolenoidvalvewillclose
B. expansionvalvewillclose
C. compressorwillshutdown
D. kingvalvewillopen
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