当水中含有大量硫酸钠、硫酸镁时,水质呈()。
A.苦味
B.咸味
C.涩味
D.沼泽味
E.汽油味
参考答案:A
把方程2(x+y)﹣3(y﹣x)=3改写成用含x的代数式表示y的形式,则[ ]
A.y=5x﹣3
B.y=﹣x﹣3
C.y=5x+3
D.y=﹣5x﹣3
Even if these chemicals are still in experimental stages, they _____ to be a number one hit.
A.intend
B.predict
C.arrange
D.Promise