减小量化误差,需增大计数值N,而增大闸门时间Ts或者在相同的闸门时间内测量较低的频率可得到较大的N。
A. 对
B. 错
When do we have the World Water Day?What’s the purpose of the special day?
Do you know any quotation or proverb about environmental protection? please make a list of it .(at least 3).
Theme in 2015 is ___________________.