小明的身高为a米，小亮的身高比小明低b米，则小亮的身高为（ ）米。
a-b
脐膨出
A．肠套叠病程36小时，全身情况可B．肠管坏死，极度危急时C．口服碳片8小时后由肛门排出D．果酱样血便E．肠套叠病程56小时
We are in receipt of your letter of 1 st September, in forming us of the establishment of your L/C No. 894 ______ our S/C No. 90US9094.
A．againstB．underC．covered D．on
