块煤重介分选时，理论分选密度与实际分选密度的差值近似为0.
A. 对
B. 错
重选产品预测计算表中，计算出的各产品中是不含浮沉煤泥的，但是含次生煤泥。
A. 对
B. 错
Bidding farewell should be conducted with __________?
A. efficiency and sincerity
B. patiency and carefulness
C. considered and carefulness
D. persistence and sincerity
What is the third step of bidding farewell?
A. You should discuss with the tour leader and driver times for luggage collection
B. You need to check the flight tickets.
C. You should finish the hotel checkout.
D. You need to confirm the time of departure for the airport with the driver and tour leader.
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