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【单选题】
干燥失重测定法中,取供试品,在规定条件下干燥至恒重,所谓恒重是指( )A.
连续两次干燥后的质量差异在0.3 mg以下
B.
第二次干燥后的质量比前一次的少0.4 mg以下
C.
连续两次干燥后的质量差异在0.5 mg以下
D.
干燥前后的质量差异在0.3 mg以下
E.
连续两次干燥后的质量差异在0.1 mg以下
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【单选题】He must have had an accident, or he ( ) then.
A.
would have been here
B.
had to be here
C.
should he here
D.
would he here
【多选题】第五章32.景区要有必要的安全设施及制度,切实保障游客安全。主要包括()
A.
场所的安全保障
B.
设施设备的安全保障
C.
有针对景区工作人员的安全保障制度
D.
有针对旅游者的安全保障制度
E.
经过景区安全风险评估
【多选题】景区要有必要的安全设施及制度，切实保障游客安全。主要包括（ ）
A.
场所的安全保障
B.
设施设备的安全保障
C.
有针对景区工作人员的安全保障制度
D.
有针对旅游者的安全保障制度
E.
经过景区安全风险评估
【单选题】He must have had an accident , or he here for class then .
A.
had to be
B.
should be
C.
would be
D.
would have been
【单选题】He must have had an accident，or he ______ then．
A.
would have been here
B.
should be here
C.
had to be here
D.
would be here
【单选题】He must have had an accident, or he now.
A.
would have been here
B.
had to be here
C.
should be here
D.
would be here
【简答题】大腿、膝部保健易筋术之坐姿屈膝肌拉伸的动作要领?
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