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【单选题】
如果向量组 的秩为 ,则下列命题中正确的是( )A.
向量组中任意r-1个向量都线性无关
B.
向量组中任意r个向量都线性无关
C.
向量组中任意r-1个向量都线性相关
D.
向量组中任意r+1个向量都线性无关
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反馈参考答案：
举一反三
【多选题】Which three statements are true about the Internet Group Management Protocol (IGMP)? （）
A.
There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode
B.
IGMP is used to register individual hosts with a multicast group
C.
IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from
D.
IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1
E.
IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP
F.
IGMP snooping ru ns on Layer 3 routers
【单选题】党在过渡时期的总路线的主要内容被概况为“一化三改”，也比喻为鸟的“主体”和“两翼”。“主体”是指（ ）
A.
对个体农业的社会主义改造
B.
对手工业的社会主义改造
C.
社会主义工业化
D.
对资本主义工商业的社会主义改造
【多选题】What are the advantages for the students to wear uniforms?
A.
To create a sense of unity and reduce the risk of fights.
B.
To help students put more energy on study, rather than clothing.
C.
To cut out unnecessary expenses.
D.
To avoid being laughed at by other students for wearing unsuitable clothes.
E.
To violate civil rights.
【单选题】Among the three modes of payment-----L/C, D/P and D/A，in terms of the risk, from the point of the seller, the correct order is( ).
A.
L/C < D/P < D/A
B.
L/C > D/P > D/A
C.
L/C < D/A < D/P
D.
L/C > D/A > D/P
【简答题】The study also found that 22 percent of all schools did not require students to take any P. E. (体育课).
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