(1).()二氧化钛(2).()山梨醇(3).()琼脂(4).()乙基香草醛
空胶囊组成中各物质起什么作用
A.增塑剂
B.增稠剂
C.遮光剂
D.矫味剂
参考答案:C,A,B,D
Not until ________ the Internet ________ that the Chinese sailors were rescued by the European Union Task Force.
A.did I surf; did I know
B.did I surf; I knew
C.I surfed; did I know
D.I surfed; I had know
煤气吹管火焰加氧气助燃,其最高温度可达到
A.700℃B.900℃C.1 100℃D.1 300℃E.1 600℃