滴丸与胶丸的相同点是
A．均为药物与基质混合而成B．均可用滴制法制备C．均以明胶为主要囊材D．均以PEG为主要基质E．无相同之处
参考答案：B
根据句子意思，用括号中所给词的正确形式填空，每空填一词。
1. English dictionaries are very ______ (use) to you when you study English.
2. Could you pass the ______ (knife) to me? We need them to make pumpkin lanterns.
3. Don't be ______ (patient)! You should listen to what he is saying first.
4. Four ______ (five) of the students in our class have heard about the trip.
5. The guide has collected all the ______ (visit) ID cards.
重心过于靠前或靠后，会有哪些不利的影响（）
A.可能造成飞机在地面产生倾斜
B.使得前轮无载重，造成无法控制滑行或滑跑方向
C.使得安定面配平必然处于上偏或下偏的较大位置，造成飞机的气动不稳定
D.以上全部
