During the PSC inspection, under the provisions of SOLAS 74, which one may not be regarded as clear grounds for ships’ detainment?（）
A. excess amount of oily-water mixtures in bilges
B. insulation of piping including exhaust pipes in engine room contaminated by oil
C. improper operation of bilge pumping arrangements
D. there were an actual emergency
微信支付 
支付宝支付