在正等轴测图中,平行于参考坐标面XOY的圆的轴测投影为椭圆,该椭圆的短轴平行于()
A. 轴测轴X1
B. 轴测轴Y1
C. 轴测轴Z1
D. 轴测坐标面X1O1Y1
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斜二轴测图的OZ轴向伸缩系数为()。
A. 1
B. 0.5
C. 0.67
D. 1.41
呼吸链磷酸化是在什么部位
A. 线粒体内膜
B. 线粒体外膜
C. 线粒体基质
D. 细胞质
He's so calm when he answers questions in interviews. I wish I could be that________ .
A. cohesive
B. concert
C. current
D. coherent
2. The academic language can not be acquired through ______.
A. simulation
B. observation
C. experiment
D. study