题目内容

Gary controls a small laser pointer by pressing the buttons,

A. Right
B. Wrong
C. Not mentioned

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A. number
B. amount
C. bundle
D. sum

A. лA1,A2,…，An(σF(E))≡σF(л A1,A2，…，An(E))
B. E1∞E2≡E2∞E1
C. (E1∞E2)∞E3≡E1∞(E2∞E3)
D. σF1(σF2(E)≡σF1 ∧F2(E)

A. Ⅰ和Ⅱ
B. Ⅰ和Ⅲ
C. Ⅱ和Ⅲ
D. Ⅰ、Ⅱ和Ⅲ

A. to
B. for
C. into
D. with