采气工作中,常见的中毒现象有那些?
参考答案:
(1)硫化氢中毒;
(2)天然气中毒;
(3)甲醇中毒;
(4)水银中毒;
(5)一氧化碳中毒;
(6)缓蚀剂中毒。
Millionaires are often very generous and __a lot of their money to charities to help the poor.
A.give in
B.give up
C.give away
D.give off
A.电流表的示数为3/11 A
B.通过灯泡的电流的频率为50Hz
C.电流表的示数为3/22 A
D.理想变压器原、副线圈匝数之比为2:1