【单选题】理论和实践都证明,( )配置资源是最有效率的形式。
【判断题】混凝土受拉时的弹性模量与受压时相同。( )
【单选题】After greeting a new guest, the receptionist needs to _____.
A.
call housekeeping department to check the room.
B.
ask the guest the length of his stay.
C.
ask for the guest's ID card
D.
check the guest's reservation
【单选题】After greeting a new guest, the receptionist’s first action should be to _____.
A.
check the guest’s reservation
B.
ask the guest the length of his stay.
C.
ask the guest to register
【单选题】促进T细胞活化与增殖的最重要的CK是()。
【单选题】下列关于免疫耐受的说法正确的是
A.
免疫耐受是对某一抗原物质上的所有决定簇都具有特异性
E.
免疫耐受形成只与抗原的性质有关,与机体因素无关