【单选题】In summer, women like to wear clothes _________ silk. They feel _________. [ ]
B.
are made of, comfortable
D.
are made of, comfortably
【判断题】Silk is a natural protein fiber obtained from the cocoons of the silkworm.
【单选题】Hangzhou ________ as the City of Silk. Tourists like shopping for silk there.
【单选题】_______about the super thin material, she touched it and learned that it ______ like silk. [ ]
B.
Being curious; was felt
【单选题】下列有关维生素D的叙述,错误的是
A.
维生素D的活性形式是1,25-(OH)2- D2
【单选题】下列有关维生素D的叙述,错误的是
A.
维生素D的活性形式是1,24-(OH)-D3
【判断题】介电系数是表征木材在交流电场作用下介质的极化强度和介电体存储电荷能力的物理参数;其值越大,表明木材电绝缘性越好,储存电能能力越小。( )
【单选题】Hangzhou ________ as the City of Silk. Tourists like shopping for silk there.