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【单选题】
关于釉牙本质界处的小弧线的说法，正确的是A.
位于牙釉质
B.
位本质
C.
凹面向着牙釉质
D.
凹面向着牙本质
E.
小凹线间的嵴在冠部不明显
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【简答题】The former lake bed is now a _____________ plain producing good crops of wheat. thrust overseas fertile split keen sustain grip reflect identify margin previous hesitate bud whichever slim glow
【单选题】电路如图 3 - 11 所示,已知电源电动势 E 1 = 6 V 、 E 2 = 1 V , 电源内阻不计, 电阻 R 1 = 1Ω , R 2 = 2Ω , R 3 = 3Ω。则 R 3 上的电流。
A.
3A
B.
2A
C.
1A
D.
5A
【单选题】已知集合A={x|x 2 -4x+3≤0}，集合B为函数 y= x-2 的定义域，则A∩B等于（ ）
A.
{x|1≤x≤2}
B.
{x|2≤x≤3}
C.
{x|x≥2}
D.
{x|x≥3}
【单选题】We were swimming in the lakesuddenly the storm started．
A.
when
B.
while
C.
until
D.
before
【多选题】下面哪些句子用 sway 不恰当?
A.
We also wondered if a different context would sway students' opinions and focus as Twitter users within a higher education classroom.
B.
A faint, sharp wind made the branches of the tree around the lake sway slightly, like enraptured concertgoers. Ramon and the rest of the family had retreated
C.
How would I describe former President Bill Clinton's golf sway ? Entertaining and erous. Let's start with the good stuff.
D.
…my knees and shuffle forward, but Sean sleeps on a water bed so I sway back and forth, then kind of topple into him. He looks down on…
E.
He also said that the boss' mood can sway wildly from day to day’? depending upon the success of SpaceX and his car company…
【简答题】如图所示,已知电源电动势 E=2V ,内电阻不计,外电路电阻 R1=1 Ω, R2= Ω, R3=3 Ω, R4=6 Ω。求: A 、 B 、 C 、 D 四点的电位?
【单选题】已知集合A={x|x 2 -5x+6≤0}，B={x||2x-1|＞3}，则集合A∩B=（ ）
A.
{x|2≤x≤3}
B.
{x|2≤x＜3}
C.
{x|2＜x≤3}
D.
{x|-1＜x＜3}
【简答题】如图所示,已知电源电动势E 1 =18V,E 3 =5V,内阻r 1 =1Ω, r 2 =1Ω,外电阻R 1 =4Ω, R 2 =2Ω, R 3 =6Ω, R 4 =10Ω,电压表的读数是28V,求电源电动势E 2 和A、B、C、D各点的电位。
【简答题】计算题：如图所示，已知电源电动势E 1 ＝6V，E 2 ＝1V，电源内阻不计，电阻R 1 ＝1Ω，R 2 ＝2Ω，R 3 ＝3Ω，试用支路电流法求各支路的电流。
【单选题】We were swimming in the lake _____ suddenly the storm started.
A.
when
B.
until
C.
while
D.
before
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