【C4】A．situationB．circumstancesC．backgroundD．condition

下列公式中，哪一个是合法的舍位平衡公式？A、C4=C1＋C2－C3B、C4=C1*C2－C3C、C4=C4@1＋C3D、C4=C3＋C2

After the explosion, the factory was a ______of total confusion.A．situationB．sceneC．viewD．

下列哪种成分是C3转化酶A.C3bnBbB.C4b2a3bC.C4a2bD.C4b2a

撰写成就故事包含哪些要素？A.SituationB.Task／TargetC.Action／AttitudeD.Results

【C2】A．situationB．circumstanceC．backgroundD．condition

The expression under fire in the first paragraph means ______.A.in an urgent situationB.