在转动式雪糕冷冻机中，一般使用（）溶液进行冷却。
A、氯化钠
B、氯化镁
C、氯化锌
D、硫酸钙
参考答案：A
The dog had such ______ to his master that it would not leave him, even when he was dead.
A．invitation
B．attention
C．protection
D．devotion
离退休人员死亡待遇是如何计发的？
