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【简答题】
目前工业上常用的压力检测方法和压力检测仪表很多,根据敏感元件和转换原理的不同,一般分为四类:( )、( )、( )、( )。
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【简答题】混凝土的水灰比W/C和相应的28d抗压强度f 28 试验数据列于下表，试确定f 28 —C/W的经验公式，并计算其相关系数。 编号 水灰比 W/C 灰水比 C/W 28d抗压强度 f 28 (MPa) 1 0.40 2.500 36.3 2 0.45 2.222 35.3 3 0.50 2.000 28.2 4 0.55 1.818 24.0 5 0.60 1.677 23.0 6 0.65 1....
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【判断题】卡莫司汀是1,4-二经基-5,8-双[[2-[(2-经乙基)氨基]乙基]氨基]-9,10-蒽醌
A.
正确
B.
错误
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【单选题】4只纯电阻的用电器其额定电压和额定功率分别列于下面，其用电器电阻最大的是()。
A.
“220V、40W”
B.
“220V、100W”
C.
“36V、100W”
D.
“l10V、100W”
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【判断题】所谓有效成分,是指具有生物活性的单体化合物,能用分子式和结构式表示的,具有一定物理常数的物质。
A.
正确
B.
错误
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【单选题】The first birds appeared during late Jurassic times. These birds are known from four very good skeletons, two incomplete skeletons, and an isolated feather, all from the Solnhofen limestone of Bavaria...
A.
nesting materials
B.
four skeletons in good condition
C.
two fragmented skeletons
D.
a single feather
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【单选题】8位二进制补码1111 1111表示的实际数字是?
A.
-1
B.
-127
C.
-128
D.
-256
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【单选题】8位二进制补码1111 1110表示的实际数字是?
A.
-1
B.
-2
C.
-3
D.
-4
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【单选题】The fossil remains of the first flying vertebrates, the pterosaurs. have intrigued paleontologists for more than two centuries, How such large creatures, which weighed in some eases as much as a pilot...
A.
enormous wingspans of the pterosaurs enabled them to fly great distances
B.
structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to hats
C.
fossil remains of the pterosaurs reveal how they solved the problem of powered flight
D.
pterosaurs were reptiles
查看完整题目与答案
【单选题】The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. How such large creatures, which weighed in some cases as much as a pilot...
A.
enormous wingspan of the pterosaurs enabled them to fly great distances
B.
structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to bats
C.
fossil remains of the pterosaurs reveal how they solved the problem of powered flight
D.
pterosaurs were reptiles
查看完整题目与答案
【简答题】（下0w下?五河县模拟）一个圆锥形的沙堆，量得底面周长是w下.46米，高是w.下米，u果每立方米沙重w.4吨，这堆沙重多少吨？（得数保留一位小数）
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相关题目：
【简答题】混凝土的水灰比W/C和相应的28d抗压强度f 28 试验数据列于下表，试确定f 28 —C/W的经验公式，并计算其相关系数。 编号 水灰比 W/C 灰水比 C/W 28d抗压强度 f 28 (MPa) 1 0.40 2.500 36.3 2 0.45 2.222 35.3 3 0.50 2.000 28.2 4 0.55 1.818 24.0 5 0.60 1.677 23.0 6 0.65 1....
查看完整题目与答案
【判断题】卡莫司汀是1,4-二经基-5,8-双[[2-[(2-经乙基)氨基]乙基]氨基]-9,10-蒽醌
A.
正确
B.
错误
查看完整题目与答案
【单选题】4只纯电阻的用电器其额定电压和额定功率分别列于下面，其用电器电阻最大的是()。
A.
“220V、40W”
B.
“220V、100W”
C.
“36V、100W”
D.
“l10V、100W”
查看完整题目与答案
【判断题】所谓有效成分,是指具有生物活性的单体化合物,能用分子式和结构式表示的,具有一定物理常数的物质。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The first birds appeared during late Jurassic times. These birds are known from four very good skeletons, two incomplete skeletons, and an isolated feather, all from the Solnhofen limestone of Bavaria...
A.
nesting materials
B.
four skeletons in good condition
C.
two fragmented skeletons
D.
a single feather
查看完整题目与答案
【单选题】8位二进制补码1111 1111表示的实际数字是?
A.
-1
B.
-127
C.
-128
D.
-256
查看完整题目与答案
【单选题】8位二进制补码1111 1110表示的实际数字是?
A.
-1
B.
-2
C.
-3
D.
-4
查看完整题目与答案
【单选题】The fossil remains of the first flying vertebrates, the pterosaurs. have intrigued paleontologists for more than two centuries, How such large creatures, which weighed in some eases as much as a pilot...
A.
enormous wingspans of the pterosaurs enabled them to fly great distances
B.
structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to hats
C.
fossil remains of the pterosaurs reveal how they solved the problem of powered flight
D.
pterosaurs were reptiles
查看完整题目与答案
【单选题】The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. How such large creatures, which weighed in some cases as much as a pilot...
A.
enormous wingspan of the pterosaurs enabled them to fly great distances
B.
structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to bats
C.
fossil remains of the pterosaurs reveal how they solved the problem of powered flight
D.
pterosaurs were reptiles
查看完整题目与答案
【简答题】（下0w下?五河县模拟）一个圆锥形的沙堆，量得底面周长是w下.46米，高是w.下米，u果每立方米沙重w.4吨，这堆沙重多少吨？（得数保留一位小数）
查看完整题目与答案