Which state of Australia is Melbourne in
A. Victoria.
B. Queensland.
C. New South Wales.
D. South Australi
电缆槽采用螺栓连接，宜用( )，螺母应在电缆槽的外侧，各部位连接牢固。
A. 半圆头螺栓
B. 方头螺栓
C. 椭圆头螺栓
D. 六边形螺栓
Some scientists' explanation of dreams______.
A. is widely accepted by the majority
B. gives us an exact answer to the problem
C. does not give an outlet for our wishes
D. offers a meaningful approach to the problem
下列有关维生素D的叙述，哪项是错误的
A. 维生素D的活性形式是1，25-(OH)2-D3
B. 维生素D的两次羟化作用都是在肝中进行
C. 促进小肠中钙结合蛋白的合成
D. 提高血浆钙、磷含量
E. 缺乏时可发生佝偻病
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