在C·H·O类化合物中，微生物最适宜的碳源是( )。

()surprised me was()he could speak english so well.

a.what，how

b.what.that

c.that，that

d.whom.that

I ______ when Billy called me so late at night.

A．have surprised

B．am surprised

C．was surprised

I ______ when Billy called me so late at night.

A．have surprised

B．am surprised

C．was surprised

We were beginning to worry. It was________(usual)forDavid to be so late. 

hat I didn't doublecheck the venue. My assistant had told me that it was to be held in the Hilton Conference Center, so I just called a cab and got there. I was so surprised to find nobody there, and so I called up my assistant…She said she had left me a note and didn't interrupt me, seeing I was so busy.

(15)

A.改变锅炉给水温度

B.改变进入汽轮机的主蒸汽量

C.改变发电机励磁电流

D.改变锅炉主蒸汽温度

所有行业企业2014年1月1日后新购进的专门用于研发的仪器、设备，单位价值不超过100万元的，允许一次性计入当期成本费用在计算应纳税所得额时扣除，不再分年度计算折旧。所有行业企业持有的单位价值不超过5000元的固定资产，允许一次性计入当期成本费用在计算应纳税所得额时扣除，不再分年度计算折旧。()

此题为判断题(对，错)。

此题为判断题(对，错)。