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问题:

[单选] The meat box temperature control circuit, as used in ship service refrigeration system, is an example of ()

A . two position control
B . signal speed floating control
C . proportional control
D . reset control

On entering from seaward,a starboard side daymark will(). show a fixed red light if lighted。 show a Morse (A) white light。 be square in shape。 have an even number if numbered。 营销员应文明礼貌,统一着装,说文明用语,() 可以讲本地方言。 不说服务忌语。 可以脱岗。 不打电话。 处于生长发育时期的青少年儿童,应该首先多吃下列哪一类食物() A.糖类。 B.蛋白质。 C.脂肪。 D.无机盐。 由船底过渡到舷侧的转圆部分称为什么? Navigation lights must be displayed in all weathers from sunset to sunrise. They also(). must be displayed when day signals are being used。 must be displayed when moored to a pier。 may be extinguished at night on open waters when no other vessels are in the area。 may be displayed during daylight。 The meat box temperature control circuit, as used in ship service refrigeration system, is an example of ()
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