One concern people have now is ______ printing passengers’ names and ID numbers on tickets will make it harder to protect their private information.

A．whether

B．when

C．how

D．that

金属波纹储油柜更换后在限定体积时压力（），时间12h应无渗漏（内油式不能充压）。

A.0.03MPa～0.04MPa

B.0.02MPa～0.03MPa

C.0.04MPa～0.05MPa

D.0.05MPa～0.06MPa