外币汇票的有效期是()
A、一年
B、一年零一个月
C、一年零三个月
D、十天
参考答案:A
Find out the mistakes and correct them. 找出错误并改正。
( ) 1. North points down on a map.
A B C D
( ) 2. This is China flag.
( ) 3. Today is May two.
A B C
( ) 4. I go to school on bus.
( ) 5. How do Jenny go to school?
莫尔法可以测定下列哪种试样中Cl的含量?()
A.NaCl
B.BaCl2
C.CaCl2
D.FeCl3