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【简答题】
如图，在四棱锥P-ABCD中，PD⊥平面ABCD，PD=DC=BC=1，AB=2，AB∥DC，∠BCD=90°， (Ⅰ)求证：PC⊥BC； (Ⅱ)求点A到平面PBC的距离．
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【单选题】What can we assume from the passage?
A.
Most people who feel they have been wronged have a ready remedy in courts of law.
B.
Many people would like to bring a case to court, but are unable to because of the cost and time required.
C.
The judicial system in the United States is highly acclaimed for its efficiency.
D.
Pretrial conferences will someday probably have replaced trials completely.
【简答题】三相异步电动机的调速方法有哪几种?
【单选题】What can we assume from the passage?
A.
Most people who feel they have been wronged have a ready remedy in courts of law.
B.
Many people would like to bring a case to court, but are unable to because of the coat and time required.
C.
The judicial system in the United States is highly acclaimed for its efficiency.
D.
Pretrial conferences will someday probably have replaced trials completely.
【简答题】求内力的基本方法是?
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