自动喷水灭火局部应用系统采用K=80喷头且喷头总数不超过()只,可不设报警阀组。
A、12
B、15
C、20
D、50
参考答案:C
阅读理解,判断正(T)误(F)。
Hello, my name is Betty. I'm a student. My favourite season is spring. Because I like flying kites. It is good
for our health. I have a good friend. Her name is Mary. She likes winter best. She can make a snowman in
winter. So we fly kites in spring and make a snowman in winter together.
( ) 1. Betty's favourite season is spring.
( ) 2. She likes flying kites.
( ) 3. She has two good friends.
( ) 4. Her friend likes winter best.
( ) 5. They fly kites in winter.
土的饱和度是土中()
A.水
B.土粒
C.气体
D.孔隙
E.以上全错