【单选题】These flowers are in_spring.
【单选题】These flowers are very____ in this country.
【简答题】根据工作信号频率范围滤波器可以分为:低通滤波器、 、带通滤波器及 。
【单选题】While driving, you are allowed to use your hand held mobile phone to .
A.
chat with your assistant
B.
make an emergency call
C.
look for a UHaul location
D.
receive and send messages
【单选题】These flowers are made .
【判断题】膈肌上有三个裂孔,食管裂孔、腔静脉裂孔和主动脉裂孔,分别有食道、气管和主动脉通过。
【简答题】膈肌上有三个裂孔:( )、( )和( )。
【简答题】膈肌位于胸膜腔之间,上面形成______的底,下面形成______的顶,主要有三大裂孔,即___________、____________及__________。还有四个膈孔,两个前称为______________,两个在后称____________,是膈的薄弱环节。