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冷冻机油在空调制冷系统中完全（）制冷剂中，并随制冷剂一起在制冷系统中循环。

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If the Charterer sends the vessel on her last voyage at a time when there is no expectation that she will be redelivered within a reasonable time of the end of the period of the Charterparty，and she is in fact redelivered late，he（）.

A. has properly fulfilled the contract
B. is not guilty of a breach of contract
C. is entitled a right to take legal action against any loss or damage he suffered in this connection
D. is guilty of a breach of contract

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为减小困油现象的危害，常在齿轮泵啮合部位侧面的泵盖上开（）。

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长江是中国最大河流，从干流长度和入海水量论，长江均居世界第（）位。

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帧中继物理层接口速率从（）kb/s到T1或E1。

A. 64
B. 128
C. 512
D. 2048

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