触摸屏从技术和实现手段上分成()()()()几种方式。
参考答案:红外;电阻;电容;表面声波屏
(C)
From the last sentence of the passage, we learn the man ______ before the doctor told him not to smoke more than one cigarette a day.
A. was a heavy smoker B. didn’t smoke so muchC. didn’t smoke D. began to learn to smoke
下列做法中,能减小摩擦的是 [ ]
A.饮料瓶盖上刻有条形花纹
B.在汽车轮胎上装防滑链
C.往冰雪路面上撒煤渣
D.往门轴中加润滑油