呼吸运动对静脉回流的促进作用主要是由于
A.吸气时,腹内压增高
B.呼气时、肺内压增高
C.吸气时,肺内压增高
D.吸气时,胸内压降低
E.吸气对,胸内压升高
参考答案:D
-Would you mind giving your advice on how to improve our business management?
-If you make ______ most of the equipment, there will be ______ rise in production.[ ]
A.不填;不填
B.the;a
C.不填;a
D.the;不填
以下xDSL技术中,关注于提高下行带宽的技术是()
A、ADSL
B、SHDSL
C、ADSL2+
D、READSL2