∠1和∠2为锐角,则∠1+∠2满足[ ]
A.0°<∠1+∠2<90°
B.0°<∠1+∠2<180°
C.∠1+∠2<90°
D.90°<∠1+∠2<180°
答案:B
—Congratulations______you, Tom. You did the best.
—Thank you.[ ]
A. to
B. on
C. for
D. with
双投刀开关在分闸或合闸位置时,刀片应可靠固定,能够自行合闸。