【单选题】下列定额中,不属于计价性定额的是( ) 。
【单选题】If you are invited to a person’s home for a social occasion, you’d better arrive ______.
A.
at the exact time specified
B.
earlier than the specified time
C.
several minutes later than the specified time
D.
half an hour later than the specified time
【单选题】下列定额中不属于国家规定的计价定额的是( )。
【单选题】作为 金属指示剂 必须具备以下条件有(): 1 .金属指示剂与金属离于形成的配合物的颜色,应与金属指示剂本身的颜色有明显的不同,这样才能借助颜色的明显变化来判断终点的到达。 2 .金属指示剂与金属离子形成的配合物 MIn 要有适当的稳定性。 3.金属指示剂与金属离子之间的反应要迅速、变色可逆,这样才便于滴定。 4 .金属指示剂应易溶于水,不易变质,便于使用和保存。
【判断题】You’d better arrive ten minutes earlier when you are invited to have dinner at your French friend’s house.
【判断题】You’d better arrive to the room in which you will be speaking early to make sure everything is functional for your speech.