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【判断题】
第一类污染物指标中,包含苯并(a)芘这样一种含有苯环的物质。A.
正确
B.
错误
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举一反三
【单选题】Which of the following is NOT true according to the passage?
A.
The International Students Exchange Program was started in 1979.
B.
Everyone must get into a school through the application process.
C.
The United States is one of the countries where students can study.
D.
The money paid for the program is the same as that at their own school.
【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】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
【单选题】依据《道路交通安全法》，下列关于车辆通行的说法，正确的是( )。
A.
机动车通过没有交通信号灯的交叉路口时，应当减速慢行，并让行人先行
B.
机动车载运爆炸物品应当按最短路线、指定的时间和速度行驶
C.
电动自行车在非机动车道内行驶时，最高时速不得超过30km
D.
铰接式客车驶入高速公路，最高时速不得超过120km
【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).
【单选题】The purpose of the this study was to investigate comparative reading achievement of seventh-grade students from selected ethnic group.
A.
problem
B.
research questions
C.
hypothesis
D.
procedure
E.
findings
F.
conclusion
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