当设备内绝对压力小于当时大气压时，则设备内气体状态为真空状态。
参考答案：对
A series of stimulus policies and supportive measures taken by the government ________ to promote
change in the economic environment in this area. [ ]
A. is expected
B. are expected
C. is expecting
D. are expecting
韦氏儿童智力量表的中度智力迟滞等级分数是（）。
A、50到69之间
B、35到49之间
C、20到34之间
D、20分以下
