已知HF的Ka=3.6×10-4 mol·L-1,CaF2的Ksp=1.46×10-10 mol2·L-2。向1 L 0.1 mol·L-1的HF溶液中加入11.1 g CaCl2,下列有关说法正确的是( )
A. 通过计算得知,HF与CaCl2反应生成白色沉淀
B. 通过计算得知,HF与CaCl2不反应
C. 因为HF是弱酸,HF与CaCl2不反应
D. 如果升高温度,HF的Ka、CaF2的Ksp可能增大,也可能减小
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"To reserve a room" means_____________.
A. to live in a room
B. to clean a room
C. to book a room
D. to keep a room
A reservationist is a hotel employee______________.
A. who is in charge of reservations
B. who would like to reserve a room in the hotel.
C. who is making a call at the reservation desk
D. who checks in the guests
An operator is normally a woman_______________.
A. working at the reception desk
B. working at the Switchboard
C. working in the office of the manager
D. working at the Business Center
_____________desk is responsible for receiving and processing reservation.
A. Front Office
B. Reservation
C. Reception
D. Cashier's
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