Where does the woman first direct the man to?
A．To the manager's office.
B．To the paperback section.
C．To the textbook area.

莫尔法中指示剂[CrO42-]理论用量为1．2×10-2 mol·L-1，实际滴定时[CrO42-]为5×10-3mol·L-1，须加入稍过量的AgNO3溶液才能显示终点，由此引起的误差属于系统误差( )。A．正确B．错误

A.2×10-2
B.正确
B．错误

点击查看答案

听力原文：W: I'm sorry I was engaged last night.M: I wish you had come to our party.Q: What does the man imply?(4)A．It is a pity that the woman failed to come to the party.B．The woman did not like the party at all.C．The man himself didn't show up at the party either.

A.
M:
B.
Q:
C.It
D.
B．The
E.
C．The
F.

点击查看答案