【单选题】In a few years , China will be able to produce the camera recorders on a large _______.
【简答题】下列方程组是二元二次方程组的是( ) A. x+3y=5 4x-6y=9 B. x 2 -3 y 2 =2x+5 x+ 1 y =3 C. y=3-5 x 2 x 2 -x-6=0 D. x 2 +1 =2y 3y=-x
【多选题】下面关于凭证录入的输入校验说法正确的有( )。
D.
发生额是否满足“有借必有贷,借贷必相等”的记账凭证要求
【单选题】China has ______population than Japan.
【判断题】多核苷酸链的3’-末端含有自由的3’-OH。
【单选题】China is the third ______ country in the world. [ ]