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一、单项选择题 (每小题 3分 ,共 2 1分 )1.下列各组物质中 ,都属于导体的是 ( ) .(A)人、大地、塑料 (B)金属、油、橡胶(C)玻璃、油、陶瓷 (D)大地、金属、盐水2 .利用平面镜 ,可以 ( ) .(A)改变光的传播方向 (B)改变像的大小(C)成倒立的虚像 (D)成正立的实像3.
First, single-choice questions (3 points for each question, a total of 21 points) 1. The following groups of substances, all belong to the conductor is () (A) people, earth, plastic (B) metal, oil, rubber ( C) Glass, Oil, Ceramics (D) Earth, Metals, Brine 2. Using a Plane Mirror, you can () . (A) change the direction of light propagation (B) change the size of an image (C) into an inverted virtual image (D) becomes positive Real image 3.