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【简答题】
计算： （1） ； （2）cos60°-sin 2 45°+tan 2 30°+tan75°cot75°-tan45°
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A.
that
B.
where
C.
why
D.
when
【单选题】下列各组离子化合物的晶格能变化顺序中,正确的是 ( ) 。
A.
(A)MgO ＞ CaO ＞ Al 2 O 3
B.
(B) LiF ＞ NaCl ＞ KI
C.
(C)RbBr ＜ CsI ＜ KCl
D.
(D) BaS ＞ BaO ＞ BaCl 2
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A.
P = a premise marker
B.
C = a conclusion marker
C.
A = an assuring term
D.
G = a guarding term
E.
D = a discounting term
F.
E+ = a positive evaluative term
G.
E- = a negative evaluative term
H.
N = none of the above
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【简答题】Bearing N32W indicates a line trending 32° west of the north.It is equal to an azimuth of 328°.