慢性湿疹最需鉴别的疾病是（）。
A.荨麻疹
B.慢性单纯性苔藓
C.急性湿疹
D.特应性皮炎
E.药疹
参考答案：B
混凝土抗折强度试验，当混凝土强度等级小于C30时，加载速度为( )MPa/s。
A．0.02～0.05
B．0.08～0.1
C．0.1～0.5
D．0.5～1.0
He set out for a remote village for ____ he hoped would be a peaceful retirement.
A．that
B．which
C．what
D．where
