在进行材料的强度和稳定性计算时,常涉及到安全系数问题,什么叫安全系数?
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目前临床尿糖试带法检测时仅与下列哪项反应()
A. 葡萄糖
B. 乳糖
C. 半乳糖
D. 果糖
E. 戊糖
直流发电机发生过电压时总负载电阻越小()
A. 过压稳定值越高,输出电流越小
B. 过压稳定值越低,输出电流越大
C. 过压稳定值越高,输出电流越大
D. 过压稳定值越低,输出电流越小
What is the major advantage of high altitude observations?()
A. Errors due to unusual parallax are eliminated
B. The same body can be used for a fix from observations separated by several minutes
C. The declination is the only information needed from the almanac
D. The semidiameter correction of the sextant altitude is eliminated