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【单选题】
Th细胞在CTL细胞的活化过程中的作用主要是A.
Th分泌促进增殖、分化的细胞因子
B.
Th能促进Tc的TCR表达
C.
Th促进Tc表达MHCⅡ类分子
D.
Th促进Tc释放穿孔素
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反馈参考答案：
举一反三
【单选题】Which of the following represents a correct thing we must ensure (check) when using a crimp lug to terminate a conductor?
A.
Ensure we use the correct size compression tool for the type of lug being used
B.
Ensure we insert the conductor into the correct colour crimp lug
C.
Ensure we do not use too much force when crimping the lug
D.
Ensure that the crimp lug inserted onto the conductor face up
【单选题】( )3. Practice ____ the piano, and you will play it well.
A.
to play
B.
play
C.
playing
D.
played
【简答题】英汉互译。 1. 中国音乐 ____________ 2. 弹古筝 ____________ 3. play the guitar ____________ 4. play the drums ____________
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