如图，为了测量油桶内油面的高度，将一根细木棒从油桶小孔插入桶内，测得木棒插入部分AB的长为100cm，木棒上沾油部分DB的长为60cm，桶高AC为80cm，那么桶内油面CE的高度是（        ）cm。

一同学制作人体口腔上皮细胞临时装片的步骤如下：（1）擦拭盖玻片； （2）在载玻片上滴清水；（3）取材；（4）染色；（5）盖上盖玻片．他的操作有哪些错误？（   ）

阅读理解
The booking notes of the play “Sherlock”
Price :$10
BOOKING
There are four easy ways to book seats for the performance:
——in person
The Box Office is open from Monday to Saturday, 10 am—8pm
——by telephone
Ring 01324976 to reserve your tickets or to pay by credit card (Visa and MasterCard).
——by post
Simply complete the booking form and return it to Box Office.
——online
Complete the on-line booking form at www. Satanfiedtheatre.com.
DISCOUNTS:
Saver: $2 off any seat booked any time in advance for performances from Monday to Thursday. Savers are available for children up to16 years old, over 60s and full-time students.
Supersavers: half-price seats are available for people with disabilities and one companion. It is advisable to book in advance. There is a maximum of eight wheelchair spaces available and one wheelchair space will be held until an hour before the show.
Standby: best available seats are on sale for $6 from one hour before the performance for people eligible for Saver and Supersaver discounts and thirty minutes before for all other customers.
Group Booking: there is a ten percent discount for parties of twelve or more.
School: school parties of ten or more can book $6 standby tickets and will get every tenth ticket free.
Please note: we are unable to exchange tickets or refund money unless a performance is cancelled due to unforeseen circumstances.

看图回答

在查阅了关于钢索桥的相关资料后，小方发现钢索桥的显著特点是(    )。