【C4】A．informingB．recordingC．supportingD．studying

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

【C20】A．study wellB．studying wellC．study goodD．studying good

How did the researchers carry out their study？A．They studied the findings of several previ

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

If a study focuses on Shakespearean language, it is a______ study.A．diachronicB．synchronic

normative study和descriptive study的关系是（)。A.can implies oughtB.规范从事实中来C.事实从