focus（）
A: on
B: in
C: to
D: ut
A: on
B: in
C: to
D: ut
举一反三
- The government is going to ____ the question of homeless people. A: focus in B: focus on C: focus to D: focus with
- Catherine said she had eaten nothing ________ she was not hungry. A: ut that B: and C: that D: ut
- 6.The children’s faces are badly________in the photograph. A: focused B: out of focus C: in focus D: without focus
- 下列哪种序列相关可用DW检验(vt为具有零均值,常数方差且不存在序列相关的随机变量)( )。 A: ut=ρut-1+vt B: ut=ρut-1+ρ2ut-2+…+vt C: ut=ρvt D: ut=ρvt+ρ2 vt-1 +…
- 承压设备制造常用的无损检测方法主要包括哪些检测方法＜br＞（） A: RT、UT、MTA、RT、UT、MT B: RT、UT、MT C: RT、UT、MT、PT、ET