在影响胰岛素分泌与合成因素中最重要的作用物是()
A.氨基酸
B.葡萄糖
C.脂肪酸
D.酮体
E.儿茶酚胺
参考答案:B
There are 4 card-processing machines in an office. The fastest of these machines processes x cards in 7 hours and the slowest processes x cards in 8 hours. Which of the following could NOT be the average time per machine for each of the 4 machines to process x cards ?()
A.7.2
B.7.3
C.7.5
D.7.6
E.7.7
视觉照明环境检测工作面水平照度在房间内距墙面1m(房间面积小时,取0.5m),距地面为()的假定工作面上进行测试,或在实际工作台面上进行测试。
A.0.4m
B.0.8m
C.1.0m
D.1.2m