电路空载时，电路中电流为（）。
A.很大
B.很小
C.无穷大
D.零
参考答案：D
单项选择。
1.下午见面问好，要说： [ ]
A. Good morning!
B. Good afternoon!
C. Nice to meet you.
2. — Nice to meet you.
— [ ]
A. Me too.
B. This is Bai Ling.
C. Nice to meet you, too.
3. “这是迈克”。翻译为： [ ]
A. This is Mike.
B. That is Mike.
C. She is Mike.
4. — Good afternoon, Zoom.
A. Good afternoon.
B. Nice to meet you.
C. Good morning.
水分在植物体内是如何运输的?
