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【单选题】
27 取葡萄糖10.00g,加水溶解并稀释至100.0mL,于20°C用2dm测定管,测得溶液的旋光度为+10.5°,其比为A.
52.5°
B.
－26.2°
C.
–52.7°
D.
+52.5°
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举一反三
【简答题】Western Blot电泳时出现“微笑”条带的原因?
【单选题】. I asked Peter and ____ of his two sisters, but none of them knew when their uncle came back.
A.
either
B.
both
C.
one
D.
Neither
【单选题】None of them knew about the plan because it ( ) a secret.
A.
keeps
B.
is kept
C.
kept
D.
was kept
【单选题】None of them knew what happened __________we told them about it.
A.
since
B.
after
C.
until
D.
while
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