我国最高国家权力机关是 [ ]
A.国务院
B.全国人民代表大会
C.最高人民法院
D.最高人民检察院
答案:B
A client who agreed to become an organ donor is pronounced dead. What is the most important factor in selecting a transplant recipient ?()
A.Blood relationship.
B.Sex and size.
C.Compatible blood and tissue types.
D.Need.
水下声道产生的原因是声线会向温度高(低)的水层弯曲。