有效数字位数多，测量结果的精度高，位数少，精度低。（）
参考答案：错
以下语句的输出结果是 ( ) Print Format $ (3678. 234."000，000，000")
A．000，003.678
B．003，678.23
C．003，678.234
D．000，003.678
—What did the doctor say? —He asked how long _________.
A．has my daughter caught a cold
B．had my daughter caught a cold
C．my daughter had caught a cold
D．my daughter had had a cold
