【简答题】维生素B1的活性形式为(),它是()的辅酶。维生素D没有活性,须经()转化为()后,才具有活性。
【单选题】主题餐厅的实质就是销售一种_______。
【单选题】Compared to a low pressure system,generally the air in a high is ().
A.
Warmer,less dense,and less stable
B.
Cool,more dense,and drier
D.
Extremely moist with high relative humidity
【单选题】对维生素D的叙述错误的是
A.
维生素D的活性形式是1,25-(OH)2-D3
【单选题】Broken valve strips in an operating low pressure, air compressor will cause _____.
A.
an immediate crankcase explosion
B.
oil contamination in the compressed air
C.
a decrease in compressor capacity
D.
no immediate loss of the compressed air capacity
【单选题】When the warm air from the sea surface begins to rise, it
A.
creates an area of low pressure.
B.
supplies cold air to the eye of a hurricane.
C.
increases the sea-surface temperature.
D.
strengthens the rotation of the earth.