关于x的方程（m2-1）x2+（m-1）x+2m-1=0是一元二次方程的条件是_

因城市实施规划的需要，纳税人自行转让原房地产的，其土地增值税( )。

A．免征

B．减半征税

C．先征后退

D．照章征税

在纯电感正弦交流电路中，下列结论正触的有（）。

A.电压与电流成正比

B.不消耗有功功率

C.电压超前电流90°

D.电压滞后电流90°

E.吸收无功功率

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Ｄ. EACH statement ALONE is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.

Is s=r
(1) s²=r²
(2) s is positive.

印度2016年的全球GDP排名是（）。

A.第七

B.第三

C.第四

D.第十

保护性隔离措施：是指为预防高度易感病人受到来自其他病人、医务人员、探视者及病区环境中各种条件致病微生物的感染，而采取的隔离措施。