【单选题】以下关于帕金森症的描述正确的是
A.
又称震颤麻痹,是中老年常见神经系统退行性疾病
B.
主要表现为不自主震颤,肌肉强直,运动迟缓和姿势平衡障碍
C.
主要原因可能是多巴胺生成减少或者乙酰胆碱增多
【简答题】以左心室为例,心脏的泵血过程包括 和 。
【单选题】What happens when people try to quit smoking gradually?
A.
They find it even more difficult.
B.
They are simply unable to make it.
C.
They show fewer withdrawal symptoms.
D.
They feel much less pain in the process.
【单选题】Problems can_____when people try to defend themselves in court without help from a lawyer.
【单选题】Although I’m a very tolerant person, I hate when people try to push my limit.
【判断题】测定混凝土的抗压强度时,试件干燥时的强度大于吸水饱和时的强度。()
【单选题】市场经济中存在企业动态联合体,他们为了共同的利益和目标,再一定的时间内结成相互协作的利益共同体,这些共同体称为()。