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【单选题】
关于恒牙的萌出,下列说法错误的是
A.
2岁半6到7岁期间,儿童口腔中仅有乳牙存在,称为乳牙牙合期
B.
约6至7岁到12至13岁,称为替牙牙合期
C.
12到13岁以后,称为恒牙牙合期
D.
6岁左右,第一磨牙位于第二乳磨牙的近中萌出
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【简答题】Howling(吼叫) is a behavior commonly observed among a wolf pack(狼群). As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. There’re d...
【单选题】换路前已经达到稳定状态,t=0时刻开关闭合,求换路后,0+时刻,电感上流过的电流I(0+)为( )
A.
0.5A
B.
1A
C.
2A
D.
5A
【简答题】阅读理解。 Howling is a behavior commonly observed among a wolf pack. As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. There are di...
【单选题】急性肠梗阻可出现下列变化,除了:
A.
肠管迅速膨胀、肠管压力升高
B.
肠壁代偿性肥厚
C.
肠壁血运障碍
D.
肠壁充血、增厚
E.
肠道穿孔
【单选题】换路前已经达到稳定状态,t=0时刻开关闭合,求换路后t>0时,与电压源相连的电阻的电压为( )
A.
8/3+1/3e(-2t)
B.
-8/3-1/3e(-2t)
C.
8/3+1/3e(-3t)
D.
-8/3-1/3e(-3t)
【单选题】急性肠梗阻可出现下列变化,除了:
A.
肠管迅速膨胀
B.
肠管压力增高
C.
肠壁代偿性肥厚
D.
肠壁血运障碍
E.
肠壁充血增后
【单选题】换路前已经达到稳定状态,t=0时刻开关闭合,求换路后t>0时,电感上流过的电流I表达式为( )
A.
1/4+1/6e(-2t)
B.
1/3+1/6e(-2t)
C.
1/2+1/4e(-3t)
D.
1/3+1/6e(-3t)
【单选题】某工程基础施工由挖基槽、浇垫层、砌砖基、回填土4个施工过程组成,在5个施工段上组织流水施工,流水节拍3d,要求垫层浇筑后2d才能砌砖基,该工程的流水施工工期为( )d。
A.
24
B.
26
C.
28
D.
30
【单选题】换路前已经达到稳定状态,t=0时刻开关闭合,求换路后,时间常数τ计算公式中R取值为( )
A.
2
B.
6
C.
8
D.
4
【简答题】Howling is a behavior commonly observed among a wolf nark. An animals, wolves work together to hunt and rely on howling was an important means of communication each other. There are different explants...
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