单相全控桥电阻性负载电路中，晶闸管可能承受的最大正向电压为（）。
A.U2
B.2U2
C.U2
D.U2
参考答案：C
根据情景选择正确的句子。
1. 当你想知道对方地址时，应说： [ ]
A. How are you?
B. Where do you live?
C. What's your address?
2. 当你想知道对方如何上学时，应说：[ ]
A. How do you go to school?
B. How are you?
C. How tall are you?
3. 当你想询问别人身高时，应说： [ ]
A. How do you do?
B. How tall are you?
C. How are you?
4. 当你想询问今天的日期时，应说：[ ]
A. What day is it today?
B. What's the date today?
C. When is it?
某土建工程以直接费为计算基础，已知直接工程费2.6万元，间接费费率为9%，利润率6%，税率3.41%，则该分项工程的综合单价应为( )万元。
A．2.689 B．2.931C．3.004 D．3.106
U2U2
U2
U2
U2U2U2U2