Choose the best answer.Why does Wang Hui knock at the Whites’ room? ______
A. To check the room.
B. To give the room card.
C. To have a chat.
D. To visit Mr. White.
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What’s wrong with Mr. White?______
A. He has a fever and a stomachache.
B. He has injured his ankle.
C. His nose is bleeding.
D. He has a toothache.
How does Wang Hui help Mr. White? ______
A. Rings the hotel
B. Calls a bus.
C. Accompanies him to see a doctor.
D. Rings the travel agency.
（计算题）澳大利亚某公司向中国出口羊毛，在合同中规定按公量计算，公定回潮率为11%。货到目的港净重为20公吨。经抽样，已知实际回潮率为15%。请写出公量计算公式。
如果机构有急回特性，则该机构的行程速度变化系数k为（）。
A. k<0
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