【单选题】下述哪种空气随高度的上升,气温下降值最小?
【单选题】These two cities are similar _________ they both have a high rainfall in June.
【单选题】如果接到要找某个话务员的私人电话,话务员应使用的规范用语是“()”。
【单选题】What does the old Chinese saying ”Calligraphy is a mirror to a person’s character.” mean?
A.
Calligraphy is very important in ancient China.
B.
Calligraphy is important to every person.
C.
Calligraphy can reflect the character of a person.
【简答题】设线段AB被P 1 ,P 2 ,P 3 ,P 4 依次分为5等分,已知P 2 (2,-2,2),P 4 (-2,4,-8),求点A及点B的坐标.
【单选题】下面不属于电话礼貌用语的是()
D.
对不起,他现在不在这里,如果您有急事,我能否代为转告?
【简答题】已知P(A)=P(B)=P(C)=0.25,P(AB)=0,P(AC)=P(BC)=1/16.求: ( 1)P(A ∪ B);(2)P(A ∪ B ∪ C);
【简答题】如图,已知ABCD-A 1 B 1 C 1 D 1 是底面为正方形的长方体,∠AD 1 A 1 =60°,AD 1 =4,P为AD 1 的中点,(1)求证:直线C 1 P ∥ 平面AB 1 C;(2)求异面直线AA 1 与B 1 P所成角的余弦值.