【单选题】听力原文:M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought it here. It's a light metal shelf almost a yard long with a magneti...
【单选题】听力原文:M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought here in your store. It's a bright metal shelf, almost a yard long a...
B.
At a big department store.
C.
At a biologist laboratory.
D.
Near a factory which produces metal shelf.
【单选题】听力原文:M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought here in your store. It's a bright metal shelf, almost a yard long a...
B.
At a big department store.
C.
At a biologist laboratory.
D.
Near a factory which produces metal shelf.
【单选题】听力原文:M: Hi, would you like some help? W: Well, I'm looking for something I saw at a friend's house a few days ago. He said he bought it here. It's a bright metal shelf, almost a yard long, with a magn...
B.
At a department store.
C.
In the woman's laboratory.
【判断题】铅酸蓄电池是一种将化学能转变为电能的装置,属于不可逆的直流电源。
【单选题】安装功率表时,必须保证电流线圈、电压线圈分别与负载相( )。