单项选择题

If the weather______more favorable in the past few months, the crops would be growing still better.
A．had been
B．has been
C．were
D．were to be

A.
A．had
B.has
C.were
D．were

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单项选择题

If wea little earlier, wewalking in the rain now.
A．left, would be
B．had left, would be
C．left, wouldn't be
D．had left, wouldn't be

A.
A．left,
B.had
C.left,
D.had

某球形产品颗粒直径为50tgn，密度为1100kg／m3。求(1)该类颗粒在250℃的静止空气流中的沉降速度；(2)在某标准旋风分离器中的径向沉降速度，此时该类颗粒被250℃的空气流以22m／s的切向速度带人器内，气流在器内的平均旋转半径为0．6m。