空胶囊组成中,山梨醇的作用为()
A.成囊材料
B.增塑剂
C.遮光剂
D.防腐剂
E.增稠剂
参考答案:B
The ice in the lake is as _____as it was before. .[ ]
A. thin
B. thinner
C. thinnest
D. much thinner
下列何部件控制备用电源系统工作()
A.GCU
B.BPCU
C.SPCU
D.AGCU