【计】 校验位

check, buy the bill, pay the bill

downbear counterflow and check vomiting

final check

1 unconvertible cheque; blank check 2 empty promise; unfulfilled promise

by-pass check valve (free-wheeled checkvalve)

by-pass check valve (free-wheeled check valve)

leak test【试验】;leakage check test【电子】

check card【计】;inspection card【计】;test card【计】