汽车冷气系统中,自压缩机送至冷凝器之冷媒是何种状态()
A.高压高温气态
B.压高温液态
C.高压低温气态
D.高压低温液态
参考答案:A
The professor walked onto the platform and seated himself in a chair,________ for answering questions.
A.had prepared
B.being prepared
C.preparing
D.prepared
世界上首次环球旅行进行了多少天()
A.80天
B.100天
C.222天
D.360天