一截面面积突然扩大的圆管，细管直径为15cm，粗管直径为30cm，当管内水的流量为0.22m3/s时，截面突然扩大处的局部损失为（）。
A. 1.48mH2O
B. 1.98mH2O
C. 3.95mH2O
D. 4.44mH20
查看答案
The defense minister promised to keep the president __________ of the situation in the Middle East.
A. being informed
B. informed
C. to be informed
D. informing
纳税人用于公益、救济性的捐赠，在年度应纳税所得额( )以内的部分，准予扣除。
A. 1.5%
B. 2%
C. 3%
D. 14%
Which of the following statements is true
A. Families worked in loosely organized groups.
B. Land was distributed to each member in a family.
C. The family was the smallest unit in westward migration.
D. Families moved westward to seek religious freedom.
What made the man so angry
A. The girl refused to refund the jeans.
B. He was given the wrong size.
C. The girl deliberately put the jeans in a box.
D. The girl didn't handle his complaint well.
微信支付 
支付宝支付