对某房地产转让价格进行评估时，经分析发现将其装修改造后能获得最大收益，这时应遵循的估

下列式子中，正确的是（　　）

A．5-|-5|=10

B．（-1）⁹⁹=-99

C．-10²=（-10）×（-10）

D．-（-2²）=4

调速方便、工作可靠的是（）顺序回路。

A.顺序伐

B.压力继电器

C.行程开关

D.行程伐

简述双因素理论的基本内容？

29. Was it at half past five when we were still sound asleep    he got up?

A．that

B．before

C．when

D．After

—When was the first man with A(H1N1) flu in mainland China known for sure
—______ May 11, 2009.

A. In
B. On
C. For
D. Since