水运是一种适宜运输量____、距离____、时效性不很强的大宗货物的运输方式.
下列叙述正确的是( )
设NA为阿伏加德罗常数的值,下列叙述正确的是( )
—______ does your cousin usually go to work on foot?—He says it's good for his health.