选择井口防喷器组合时,要考虑压力等级应()可能出现的预期井口最高压力。
A、大于
B、小于
C、等于
参考答案:A
看图,根据对话打“√”或“×”判断对错。
Liu: Excuse me. Where is the Zhong bai Supermarket, please?
Policeman: It's west of the hospital.
Liu: Is it far from here?
Policeman: Yes.
Liu: How can I get there?
Policeman: First, turn left and take the No. 16 bus at the bus stop. Next, get off at the hospital. Then, cross
(穿过) the street. You'll be in front of the Supermarket.
Liu: Thank you.
Policeman: You're welcome.
( ) 1. The post office is next to the supermarket.
( ) 2. The supermarket is west of the hospital.
( ) 3. Liu Yun goes to the supermarket on foot.
( ) 4. Liu Yun asks a policeman for help.
化学发光免疫学检测中最常用的是()
A.气相发光
B.固相发光
C.液相发光
D.双相发光
E.多相发光