Pipelines are not （）
Pipelines are not （）
Crude oil transferred through the pipelines meets ______ of annual need of China.
Crude oil transferred through the pipelines meets ______ of annual need of China.
真实气体的标准态是 ( ) A: f = py的真实气体 B: p = py的真实气体 C: f = py理想气体 D: p = py的理想气体
真实气体的标准态是 ( ) A: f = py的真实气体 B: p = py的真实气体 C: f = py理想气体 D: p = py的理想气体
一个点（Px, Py, Pz）的齐次坐标描述为（ ） A: [Px, Py, Pz]T B: [Px, Py, Pz, 0]T C: [Px, Py, Pz, 1]T D: (Px, Py, Pz)
一个点（Px, Py, Pz）的齐次坐标描述为（ ） A: [Px, Py, Pz]T B: [Px, Py, Pz, 0]T C: [Px, Py, Pz, 1]T D: (Px, Py, Pz)
消费者均衡的条件是（） A: Px/Py=MUx/MUy B: Px/Py=MUy/MUx C: Px•Qx=Py•Qy D: Px•Qy=Py•Qy
消费者均衡的条件是（） A: Px/Py=MUx/MUy B: Px/Py=MUy/MUx C: Px•Qx=Py•Qy D: Px•Qy=Py•Qy
The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
运行下面程序, 代码的执行结果是( )。 ls = [2021, 20.21, "py"] ls.append("2022") print(ls) A: [2021, 20.21, 'py'] B: [2021, 20.21, 'py', '2022'] C: ['2021', '20.21', 'py', 2022] D: ['2022', '20.20', 'py', 2021]
运行下面程序, 代码的执行结果是( )。 ls = [2021, 20.21, "py"] ls.append("2022") print(ls) A: [2021, 20.21, 'py'] B: [2021, 20.21, 'py', '2022'] C: ['2021', '20.21', 'py', 2022] D: ['2022', '20.20', 'py', 2021]
x='py',py='56',则关于eval()函数，以下正确的是： A: eval(x)='py' B: eval(x)='56' C: eval('x')=py D: eval('x')='56'
x='py',py='56',则关于eval()函数，以下正确的是： A: eval(x)='py' B: eval(x)='56' C: eval('x')=py D: eval('x')='56'
设随机变量X～N(0，1)．Y～N(1，4)且相关系数ρXY=1，则______． A: PY=-2X-1=1 B: PY=2X-1=1 C: PY=-2X+1=1 D: PY=2X+1=1
设随机变量X～N(0，1)．Y～N(1，4)且相关系数ρXY=1，则______． A: PY=-2X-1=1 B: PY=2X-1=1 C: PY=-2X+1=1 D: PY=2X+1=1
Why did some oil companies temporarily close some of their pipelines? A: Because there were no enough staff working. B: Because much of the equipment had been destroyed. C: Because those not in key positions could therefore leave the area. D: Because many pipelines had caught fire, thus threatening people there.
Why did some oil companies temporarily close some of their pipelines? A: Because there were no enough staff working. B: Because much of the equipment had been destroyed. C: Because those not in key positions could therefore leave the area. D: Because many pipelines had caught fire, thus threatening people there.