下列液压控制阀中属于压力控制阀的是( )。

【名词&注释】

局限性(limitation)、控制阀(control valve)、静脉滴注(intravenous drip)、液控单向阀(hydraulic control check valve)、肌肉注射(intramuscular injection)、救生艇(boat)、硫酸庆大霉素(gentamycin sulfate)、危险物(danger)、生产商(manufacturer)、溢流节流阀(overflow throttle valve)

[单选题]下列液压控制阀中属于压力控制阀的是( )。

A. 卸荷阀
B. 溢流节流阀^{(overflow throttle valve)}
C. 液控单向阀
D. 低压选择阀

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举一反三：

[单选题]If a refrigeration system were short of refrigerant, the condition would result in

A. continuous running of the compressor
B. high suction pressure
C. high discharge pressure
D. short cycling of the compressor on the water failure switch

[单选题]旗

A. flight
B. fly
C. fire
D. flag

[单选题]硫酸庆大霉素^{(gentamycin sulfate)}不宜用于()

A. 静脉滴注
B. 肌肉注射
C. 静脉推注

[单选题]对装有可使用雷达的船舶在决定安全航速时应考虑：I、雷达设备的局限性；II、所选用的雷达距离标尺；III、天气对雷达精度的影响；IV、雷达的生产商^{(manufacturer)}

A. I
B. I、III
C. I、II、Ⅲ、Ⅳ
D. I、II、III

[单选题]救生艇应设一盏可控制的环照灯，其颜色为：

A. 红光
B. 白光
C. 黄光

[单选题]孤立危险物^(danger)标的顶标为：()

A. 上下两垂直黑色圆锥
B. 上下两垂直黑色圆球
C. 单个红色圆球
D. 单个黑色圆球

[单选题]Which of the following represents the significance the fuel oil cetane number?

A. The cetane number has no affect on injection lag
B. The cetane number is an indication of the fuel's viscosity
C. Ignition lag is reduced with fuels having a high cetane number
D. The cetane number is of little significance in the combustion process

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