单项选择题

从未接触过雪道的初学者在平坦雪面上应该怎么做?

A.慢滑

B.快滑

C.匀速滑

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单项选择题

电压波形的数值表达式为（）。
A.
-2ε(t)+ ε(t-1) B.
-2ε(t)+3 ε(t+1)- ε(t+3) C.
-2ε(t)+3 ε(t-1)- ε(t-3) D.
-2ε(t)+3 ε(t-1)

She was ( )other applicants by her communication skills.
A、distinguished from
B、distinguishing from
C、distinguished with
D、distinguishing with

答案： distinguished from