脑疝形成的主要原因是()
A.脑组织水肿
B.脑脊液的生理调节作用减退
C.脑血流量的调节失常
D.血液内二氧化碳分压增高
E.颅腔内压力分布不均
参考答案:E
________a language family is a group of languages with a common origin and similar vocabulary, grammar, and sound system.
A.What linguists call
B.It is called by linguists
C.Linguists call it
D.What do linguists call
电镀槽要求的直流电源为7V、1500A,最好采用()电路。
A.单相半控桥;
B.三相半控桥;
C.三相半波;
D.三相双反星形。