The one American industry unaffected by the general depression of trade is the beamy industry.

美国工业中专一未受贸易大萧条影响的是美容用品业。

Model JO415 DC microammeter is suitable for students to measure weak current and slimelectric potenial in laboratory of middle school and polytechnic school.

JO415型直流安培计适用于中学、中专等学校，可电势用。

AC Milliammeter, Model J0414, is suitable for the laboratories of middle schools and polytechnic schools to measure current intensity in the AC circuit.

J0414型交流毫安适用于中学、中专等量交流电路中的电流强度。

Objective:To understand the knowledge level and attitude of school students about AIDS and their behavious factors,and to provide accordance for school propagand plans.

目的了解中专生艾滋病知、态、行现状，为学校制定艾滋病宣传策略提供依据。