磨口试剂瓶若长期不用应在瓶塞与瓶口间加放纸条，以防开启困难。
参考答案：对
---How about putting some pictures into the report?
---________ A picture is worth a thousand words.
A．I don’t think so.
B．Why not?
C．Thank you.
D．It doesn’t matter.
急性牙髓炎患牙疼痛部位的特点是
A．患者能指出患牙部位B．下颌疼痛患牙为下牙C．上颌疼痛患牙为上牙D．患牙疼痛多无放散性E．上颌疼痛患牙为下牙
