A.when
B.where
C.that
D.which
第1题:
A、have…flowing
B、have…flow
C、have…to flow
D、have…flowed
第2题:
A. In interface configuration mode, the OSPFv3 area ID combination assigns interfaces to OSPFv3 areas.
B. In router configuration mode, the network wildcard area ID combination assigns networks to OSPFv3 areas.
C. In interface configuration mode, the IPv6 OSPF process area ID combination assigns interfaces to OSPFv3 areas.
D. In router configuration mode, the IPv6 OSPF interface area ID combination assigns interfaces to OSPFv3 areas.
第3题:
6、对于下述命令,如何利用pipe符号进行改写: by_cut <- group_by(diamonds, cut) count_cuts <- mutate(by_cut, N = n())
A.count_cuts <- diamonds %>% group_by(cut) %>% mutate(N = n())
B.count_cuts <- diamonds %>% mutate(N = n()) %>% group_by(cut)
C.count_cuts <- diamonds %<% group_by(cut) %<% mutate(N = n())
D.count_cuts <- diamonds %<% mutate(N = n()) %<% group_by(cut)
第4题:
A. many - to - one
B. one - to - one
C. one - to - many
D. many - to - many
第5题:
If the bill of lading contains the words weight and quantity unknown,the shipper must ______ that the goods were in fact shipped to succeed in an action for non-deli-very.
A.show
B.make
C.get
D.have
第6题:
4、有一个dataframe名为diamonds,请问命令slice(diamonds, (n() - 5):n())执行了什么操作?
A.选择diamonds的后6行数据
B.选择diamonds的后5行数据
C.选择diamonds的后6列数据
D.选择diamonds的后5行数据