1. [单选题]Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?
A. A shortage of liquid refrigerant.
B. Excessive frost on the evaporator.
C. Excessive condenser cooling water.
D. Insufficient condenser cooling water flow.
2. [单选题]关于下列四冲程柴油机气缸套功用中不正确的是()
A. 与气缸盖、活塞组成燃烧室
B. 承担活塞的侧推力
C. 开有气口构成扫气通道
D. 与气缸体形成冷却水通道(cooling channel)
