【名词&注释】
心绞痛(angina pectoris)、硝酸甘油(nitroglycerin)
[单选题]_________ there much rice on the deck
A. are
B. is
C. be
D. has
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举一反三：
[单选题]心绞痛病人舌下含服硝酸甘油______可以止痛。
A. 1—2分钟内
B. 10—30分钟内
C. 30—60分钟内
D. 1小时以上
[单选题]The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is .
A. they operate between 150 and 450 rpm
B. they are connected to the propeller by gearing
C. their smaller size and weight
D. they can be connected directly to the propeller without gearing
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