1. [单选题]保留在船上的样品需要根据()进行保存。
A. 相似性
B. 相容性
C. 毒性
2. [单选题]Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?
A. Control the amount of lube oil burned in the combustion chamber
B. Transmit heat from the piston to the cylinder liner
C. Prevent damage to ring groove inserts by acting as a heat dam
D. Dissipate combustion chamber gas pressure by channeling it through the ring gap
3. [单选题]消毒注射部位时应______。
A. 从外到里
B. 从里到外
C. 以上都对
D. 以上都不对
