氢火焰离子化检测器是依据不同组分气体的热导率不同来实现物质测定的。( )
参考答案：错
股票不属于( )。
A．有价证券
B．货币证券
C．要式证券
D．资本证券
— I don't know _____ to do with this physics problem. It's too hard.
— You can ask your teacher for help. [ ]
A. how
B. what
C. which
