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【单选题】
关于散剂基本性质的描述,以下叙述错误的是A.
系指药物或与适宜的辅料经粉碎、均匀混合制成的干燥粉末状制剂
B.
与片剂比较,散剂易分散、起效迅速、生物利用度高
C.
与液体制剂比较,散剂比较稳定
D.
比表面积大,因此挥发性成分宜制成散剂
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【单选题】What is the function of thermostatic expansion valve in a compression refrigeration system?
A.
nonexistent
B.
for controlling pressure
C.
for controlling superheat
D.
for controlling the solenoid valve
【单选题】Moisture is removed from a refrigeration system by
A.
bleeding refrigerant from the condenser
B.
opening a drain petcock on the oil separator
C.
condensing the water in the heat exchanger
D.
using a dehydrator cartridge
【简答题】为什么要清洗氟电极,使其响应电位值负于 320 mV ?
【单选题】Low compressor head pressure in a refrigeration system can be caused by（）.
A.
insufficient condenser cooling water
B.
excessive condenser cooling water
C.
air in the refrigeration system
D.
excessive refrigerant in the system
【单选题】In the refrigeration system, the meat box temperature control circuit, as used in the ship service refrigeration system, is an example of _____.
A.
two position control
B.
single speed floating control
C.
proportional control
D.
reset control
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